LED access function

This commit is contained in:
Sebastien Bourdeauducq 2017-05-04 18:59:35 +08:00
parent 492b1e3668
commit d458a337df
1 changed files with 30 additions and 15 deletions

View File

@ -11,6 +11,20 @@ use cortex_m::ctxt::Local;
use cortex_m::exception::Handlers as ExceptionHandlers;
use tm4c129x::interrupt::Handlers as InterruptHandlers;
const LED1: u8 = 0x10;
const LED2: u8 = 0x40;
fn set_led(nr: u8, state: bool) {
cortex_m::interrupt::free(|cs| {
let gpio_k = tm4c129x::GPIO_PORTK.borrow(cs);
if state {
gpio_k.data.modify(|r, w| w.data().bits(r.data().bits() | nr))
} else {
gpio_k.data.modify(|r, w| w.data().bits(r.data().bits() & !nr))
}
});
}
fn main() {
hprintln!("Hello, world!");
@ -19,17 +33,18 @@ fn main() {
let sysctl = tm4c129x::SYSCTL.borrow(cs);
let gpio_k = tm4c129x::GPIO_PORTK.borrow(cs);
// Bring up GPIO port K
sysctl.rcgcgpio.modify(|_, w| w.r9().bit(true));
while !sysctl.prgpio.read().r9().bit() {}
// Set up LEDs
gpio_k.dir.write(|w| w.dir().bits(LED1|LED2));
gpio_k.den.write(|w| w.den().bits(LED1|LED2));
// Set up system timer
systick.set_reload(systick.get_ticks_per_10ms());
systick.enable_counter();
systick.enable_interrupt();
// Set up LED
sysctl.rcgcgpio.modify(|_, w| w.r9().bit(true));
while !sysctl.prgpio.read().r9().bit() {}
gpio_k.dir.write(|w| w.dir().bits(0x10));
gpio_k.den.write(|w| w.den().bits(0x10));
});
}
@ -40,14 +55,14 @@ extern fn sys_tick(ctxt: SysTick) {
let elapsed = ELAPSED.borrow(&ctxt);
elapsed.set(elapsed.get() + 1);
cortex_m::interrupt::free(|cs| {
let gpio_k = tm4c129x::GPIO_PORTK.borrow(cs);
if elapsed.get() % 100 == 0 {
gpio_k.data.modify(|r, w| w.data().bits(r.data().bits() ^ 0x10));
set_led(LED1, true);
set_led(LED2, false);
}
if elapsed.get() % 100 == 50 {
set_led(LED1, false);
set_led(LED2, true);
}
})
}
#[used]